NAME

       redi::pstream_common< CharT, Traits > - Class template for common base class.

SYNOPSIS

       #include <pstream.h>

       Inherits basic_ios< CharT, Traits >, and redi::pstreams.

       Inherited by redi::basic_ipstream< CharT, Traits >, redi::basic_opstream< CharT, Traits >,
       redi::basic_pstream< CharT, Traits >, and redi::basic_rpstream< CharT, Traits > [private].

   Public Types
       typedef int fd_type
           Type used for file descriptors.

   Public Member Functions
       void close ()
           Close the pipe.
       bool is_open () const
           Report whether the stream's buffer has been initialised.
       const std::string & command () const
           Return the command used to initialise the stream.
       streambuf_type * rdbuf () const
           Return a pointer to the stream buffer.

   Static Public Attributes
       static const pmode pstdin = std::ios_base::out
           Write to stdin.
       static const pmode pstdout = std::ios_base::in
           Read from stdout.
       static const pmode pstderr = std::ios_base::app
           Read from stderr.
       static const pmode newpg = std::ios_base::trunc
           Create a new process group for the child process.

   Protected Types
       typedef basic_pstreambuf< CharT, Traits > streambuf_type
       typedef pstreams::pmode pmode
       typedef pstreams::argv_type argv_type
       enum { bufsz = 32 }
       enum { pbsz = 2 }

   Protected Member Functions
       pstream_common ()
           Default constructor.
       pstream_common (const std::string &cmd, pmode mode)
           Constructor that initialises the stream by starting a process.
       pstream_common (const std::string &file, const argv_type &argv, pmode mode)
           Constructor that initialises the stream by starting a process.
       virtual ~pstream_common ()=0
           Pure virtual destructor.
       void do_open (const std::string &cmd, pmode mode)
           Start a process.
       void do_open (const std::string &file, const argv_type &argv, pmode mode)
           Start a process.

   Protected Attributes
       std::string command_
           The command used to start the process.
       streambuf_type buf_
           The stream buffer.

Detailed Description

   template<typename CharT, typename Traits = std::char_traits<CharT>>
       class redi::pstream_common< CharT, Traits >" Class template for common base class.

       Abstract Base Class providing common functionality for basic_ipstream, basic_opstream and
       basic_pstream. pstream_common manages the basic_pstreambuf stream buffer that is used by
       the derived classes to initialise an iostream class.

Constructor & Destructor Documentation

   template<typename C , typename T > redi::pstream_common< C, T >::pstream_common () [inline],
       [protected]
       Default constructor. Creates an uninitialised stream.

       References redi::pstream_common< CharT, Traits >::buf_.

   template<typename C , typename T > redi::pstream_common< C, T >::pstream_common (const
       std::string & cmd, pmode mode) [inline],  [protected]
       Constructor that initialises the stream by starting a process. Initialises the stream
       buffer by calling do_open( command , mode )

       Parameters:
           cmd a string containing a shell command.
           mode the I/O mode to use when opening the pipe.

       See also:
           do_open(const std::string&, pmode)

       References redi::pstream_common< CharT, Traits >::buf_, and redi::pstream_common< CharT,
       Traits >::do_open().

   template<typename C , typename T > redi::pstream_common< C, T >::pstream_common (const
       std::string & file, const argv_type & argv, pmode mode) [inline],  [protected]
       Constructor that initialises the stream by starting a process. Initialises the stream
       buffer by calling do_open( file , argv , mode )

       Parameters:
           file a string containing the pathname of a program to execute.
           argv a vector of argument strings passed to the new program.
           mode the I/O mode to use when opening the pipe.

       See also:
           do_open(const std::string&, const argv_type&, pmode)

       References redi::pstream_common< CharT, Traits >::buf_, and redi::pstream_common< CharT,
       Traits >::do_open().

   template<typename C , typename T > redi::pstream_common< C, T >::~pstream_common () [inline],
       [protected],  [pure virtual]
       Pure virtual destructor. This is a pure virtual function to make pstream_common abstract.
       Because it is the destructor it will be called by derived classes and so must be defined.
       It is also protected, to discourage use of the PStreams classes through pointers or
       references to the base class.

       See also:
           If defining a pure virtual seems odd you should read http://www.gotw.ca/gotw/031.htm
           (and the rest of the site as well!)

Member Function Documentation

   template<typename C , typename T > void redi::pstream_common< C, T >::close () [inline]
       Close the pipe. Calls rdbuf->close() and sets failbit on error.

       References redi::pstream_common< CharT, Traits >::buf_, and redi::basic_pstreambuf< CharT,
       Traits >::close().

   template<typename C , typename T > const std::string & redi::pstream_common< C, T >::command
       () const [inline]
       Return the command used to initialise the stream.

       Returns:
           a string containing the command used to initialise the stream.

       References redi::pstream_common< CharT, Traits >::command_.

   template<typename C , typename T > void redi::pstream_common< C, T >::do_open (const
       std::string & cmd, pmode mode) [inline],  [protected]
       Start a process. Calls rdbuf()->open( command , mode ) and sets failbit on error.

       Parameters:
           cmd a string containing a shell command.
           mode the I/O mode to use when opening the pipe.

       See also:
           basic_pstreambuf::open(const std::string&, pmode)

       References redi::pstream_common< CharT, Traits >::buf_, redi::pstream_common< CharT,
       Traits >::command_, and redi::basic_pstreambuf< CharT, Traits >::open().

       Referenced by redi::pstream_common< CharT, Traits >::pstream_common().

   template<typename C , typename T > void redi::pstream_common< C, T >::do_open (const
       std::string & file, const argv_type & argv, pmode mode) [inline],  [protected]
       Start a process. Calls rdbuf()->open( file, argv, mode ) and sets failbit on error.

       Parameters:
           file a string containing the pathname of a program to execute.
           argv a vector of argument strings passed to the new program.
           mode the I/O mode to use when opening the pipe.

       See also:
           basic_pstreambuf::open(const std::string&, const argv_type&, pmode)

       References redi::pstream_common< CharT, Traits >::buf_, redi::pstream_common< CharT,
       Traits >::command_, and redi::basic_pstreambuf< CharT, Traits >::open().

   template<typename C , typename T > bool redi::pstream_common< C, T >::is_open () const
       [inline]
       Report whether the stream's buffer has been initialised.

       Returns:
           rdbuf()->is_open().

       See also:
           basic_pstreambuf::is_open()

       References redi::pstream_common< CharT, Traits >::buf_, and redi::basic_pstreambuf< CharT,
       Traits >::is_open().

   template<typename C , typename T > pstream_common< C, T >::streambuf_type *
       redi::pstream_common< C, T >::rdbuf () const [inline]
       Return a pointer to the stream buffer.

       Returns:
           a pointer to the private stream buffer member.

       References redi::pstream_common< CharT, Traits >::buf_, redi::pstreams::pstderr,
       redi::pstreams::pstdin, and redi::pstreams::pstdout.

Author

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